ruby - AASM:将状态机定义与类定义分开

Question

假设我有这个类(直接取自 aasm 文档):

class Job < ActiveRecord::Base
  include AASM

  aasm do
    state :sleeping, :initial => true
    state :running
    state :cleaning

    event :run do
      transitions :from => :sleeping, :to => :running
    end

    event :clean do
      transitions :from => :running, :to => :cleaning
    end

    event :sleep do
      transitions :from => [:running, :cleaning], :to => :sleeping
    end
  end

end

我不太喜欢将状态机定义与类定义混合在一起的事实(当然，在实际项目中，我会向 Job 类添加更多方法)。

我想在一个模块中分离状态机定义，这样 Job 类就可以是:

class Job < ActiveRecord::Base
  include StateMachines::JobStateMachine
end

然后我在 app/models/state_machines 中创建了一个 job_state_machine.rb 文件，其内容类似于:

module StateMachines::JobStateMachine
  include AASM

  aasm do
    state :sleeping, :initial => true
    state :running
    state :cleaning

    event :run do
      transitions :from => :sleeping, :to => :running
    end

    event :clean do
      transitions :from => :running, :to => :cleaning
    end

    event :sleep do
      transitions :from => [:running, :cleaning], :to => :sleeping
    end
  end

end

但这不起作用，因为 AASM 被包含在模块中而不是 Job 类中......我什至尝试将模块更改为:

module StateMachines::JobStateMachine
  def self.included(base)
  include AASM

  aasm do
    state :sleeping, :initial => true
    state :running
    state :cleaning

    event :run do
      transitions :from => :sleeping, :to => :running
    end

    event :clean do
      transitions :from => :running, :to => :cleaning
    end

    event :sleep do
      transitions :from => [:running, :cleaning], :to => :sleeping
    end
  end
  end
end

但它仍然不起作用...非常感谢任何提示或建议。

谢谢，伊格纳齐奥

---

编辑:

感谢 Alto，正确的解决方案是这样的:

module StateMachine::JobStateMachine

  def self.included(base)
    base.send(:include, AASM)

    base.send(:aasm, column: 'status') do
    ....
    end
  end
end

并且显然记得像这样在主类中包含状态机定义:

include StateMachine::JobStateMachine

Answer 1

你不能简单地做到这一点吗？

module StateMachines::JobStateMachine
  def self.included(base)
    base.send(:include, AASM)

    aasm do
      ...
    end
  end
end